Catch NoClassDefFoundError when BuildScanExtension is not found

Add simple test with init script

#KT-59589

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/BuildReportsIT.kt

@@ -16,6 +16,7 @@ import java.nio.file.Path
 import kotlin.io.path.*
 import kotlin.test.assertTrue
 import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
+import org.jetbrains.kotlin.gradle.testbase.TestVersions.ThirdPartyDependencies.GRADLE_ENTERPRISE_PLUGIN_VERSION
 
 @DisplayName("Build reports")
 @JvmGradlePluginTests
@@ -371,4 +372,47 @@ class BuildReportsIT : KGPBaseTest() {
         }
     }
 
+    @DisplayName("build reports work with init script")
+    @GradleTestVersions(
+        minVersion = TestVersions.Gradle.MIN_SUPPORTED,
+        additionalVersions = [TestVersions.Gradle.G_7_6, TestVersions.Gradle.G_8_0],
+        maxVersion = TestVersions.Gradle.G_8_1
+    )
+    @GradleTest
+    fun testBuildReportsWithInitScript(gradleVersion: GradleVersion) {
+        project("simpleProject", gradleVersion) {
+            gradleProperties.modify { "$it\nkotlin.build.report.output=BUILD_SCAN,FILE\n" }
+
+            val initScript = projectPath.resolve("init.gradle").createFile()
+            initScript.modify {
+                """
+                    initscript {
+                        repositories {
+                            maven { url = 'https://plugins.gradle.org/m2/' }
+                        }
+
+                        dependencies {
+                            classpath 'com.gradle:gradle-enterprise-gradle-plugin:$GRADLE_ENTERPRISE_PLUGIN_VERSION'
+                        }
+                    }
+
+                    beforeSettings {
+                        it.pluginManager.apply(com.gradle.enterprise.gradleplugin.GradleEnterprisePlugin)
+                    }
+                """.trimIndent()
+            }
+
+            build(
+                "compileKotlin",
+                "-I", "init.gradle",
+            )
+
+            build(
+                "compileKotlin",
+                "-I", "init.gradle",
+                enableBuildScan = true,
+            )
+        }
+    }
+
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/TestVersions.kt

@@ -82,5 +82,6 @@ interface TestVersions {
 
     object ThirdPartyDependencies {
         const val SHADOW_PLUGIN_VERSION = "8.1.1"
+        const val GRADLE_ENTERPRISE_PLUGIN_VERSION = "3.13.4"
     }
 }

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/report/BuildScanExtensionHolder.kt

@@ -17,6 +17,10 @@ class BuildScanExtensionHolder(val buildScan: BuildScanExtension) : java.io.Seri
                 // Build scan plugin is applied, but BuildScanExtension class is not available due to Gradle classpath isolation
                 // Could be reproduced by applying Gradle enterprise plugin via init script: KT-59589
                 null
+            } catch (e: NoClassDefFoundError) {
+                // Build scan plugin is applied, but BuildScanExtension class is not available due to Gradle classpath isolation
+                // Could be reproduced by applying Gradle enterprise plugin via init script: KT-59589
+                null
             }
 
             return buildScanExtension?.let { BuildScanExtensionHolder(it) }